Guatteria decurrens R.E.Fr.

Maas, P. J. M., Westra, L. Y. T., Guerrero, S. Arias, Lobão, A. Q., Scharf, U., Zamora, N. A. & Erkens, R. H. J., 2015, Confronting a morphological nightmare: revision of the Neotropical genus Guatteria (Annonaceae), Blumea 60 (1), pp. 1-219 : 69

47. Guatteria decurrens R.E.Fr. — Map 11

Guatteria decurrens R.E.Fr. (1938) 720; Maas & Westra (2011) 119, f. 3c, 5. —

Type: Killip & Smith 29585 ( holo US ; iso F, NY), Peru, Loreto, Soledad, on Río Itaya , 110 m, 20–22 Sept. 1929 .

Guatteria rugosa R.E.Fr. (1939) 501. — Type: Krukoff 4664 (holo S; iso BM, F, G, K, M, MO, NY, U, US), Brazil, Amazonas , Basin of Rio Juruá , near mouth of Rio Embira, tributary of Rio Tarauacá, 4 June 1933.

Tree 2–35 m tall, 2–60 cm diam; young twigs densely to rather densely covered with rough, brown, erect to half-appressed hairs (‘hirsute’) to c. 3 mm long, finally glabrous. Leaves: petioles 1–7 mm long, 2–3 mm diam; lamina narrowly elliptic-obovate or narrowly elliptic, rarely elliptic, 11–34 by 4–11 cm (leaf index 2.2–5.5), chartaceous, brownish green above, brownish green to pale brown below, very densely to densely verruculose on both sides, glabrous above, densely to rather densely, sometimes sparsely covered with rough, erect to appressed hairs to c. 2 mm long below, base attenuate to acute, apex acuminate (acumen 10–40 mm long), primary vein impressed above, secondary veins distinct, 13–30 on each side, flat to slightly impressed above, forming a marginal vein, at a smallest distance of 1–5 mm from the margin, tertiary veins inconspicuous and hardly visible above, reticulate. Flowers in 1(–2)-flowered inflorescences in axils of leaves; pedicels 12–30 mm long, 1.5–2 mm diam, fruiting pedicels 25–40(–50) mm long, rather densely to sparsely covered with erect, half-appressed, or sometimes appressed hairs to 2 mm long, articulated at 0.1–0.3 from the base, bracts c. 5, soon falling, not seen; flower buds broadly ovoid to broadly ellipsoid; sepals free or basally connate, ovate-triangular to broadly ovate-triangular, 5–12 by 5–7 mm, appressed or at last reflexed, outer side densely to rather densely, sometimes sparsely covered with erect, half-appressed, or sometimes appressed hairs to c. 2 mm long; petals green, yellowish green, maturing yellow or creamy yellow in vivo, elliptic to ovate-elliptic or narrowly so, 15– 25 by 6–13 mm, outer side densely (particularly the base) to rather densely covered with appressed, pale brown hairs; stamens 1.5–2.5 mm long, connective shield papillate. Monocarps 15– 60, green, maturing purplish black to black in vivo, brown in sicco, ellipsoid, 15–25 by 7–12 mm, sparsely to rather densely covered with rough, appressed hairs, apex rounded to apiculate (apiculum < 0.2 mm long), wall 0.3–1(–1.5) mm thick, stipes 5–15 by 1–2 mm. Seed ellipsoid, 15–25 by 7–12 mm, dark brown to brown, shiny, longitudinally and transversely grooved, raphe not distinct from rest of seed.

Distribution — Amazonian Colombia (Amazonas), Ecuador (Carchi, Morona-Santiago, Napo, Pastaza, Sucumbios, Zamora-Chinchipe), Peru (Amazonas, Loreto, Pasco), Brazil ( Acre, Amazonas).

Habitat & Ecology — In primary, non-inundated, lowland or rarely premontane forest, sometimes in periodically inundated forest, on lateritic to clayey, or rarely white sandy soil. At elevations of 100–500 m, rarely (in Ecuador) to 1300 m. Flowering: August to April; fruiting: April to January.

Vernacular names — Ecuador: Caracaspi ( Alvarez et al. 2407, Zuleta 212). Peru: Carahuasca ( Ellenberg 2852, Tello 1828), Espintana ( Ayala et al. 2546), Yais (Shuar name) ( R. Rojas et al. 36).

Note — Guatteria decurrens can be confused with G. guianensis , but it differs by the indument. For further information see under the latter species.

Figures

Map 11 Distribution of Guatteria crassipes (●), G. cryandra (£), G. cus- cuoensis (■), G. decurrens (P), G. delicatula (u) and G. dotana (✸).